Pressure Sensor and Display Device Including the Same

1. A pressure sensor for a display device, comprising: a plurality of touch cells having a plurality of driving electrodes disposed on a first substrate, a plurality of sensing electrodes disposed on a second substrate overlapping the first substrate, and a pressure sensing layer interposed between the plurality of driving electrodes and the plurality of sensing electrodes, the plurality of driving electrodes and the plurality of sensing electrodes overlapping each other; and a touch driver to drive the plurality of touch cells and to detect touch pressure of the plurality of touch cells; wherein, when a plurality of touch areas including at least one touch cell are detected, the touch driver is configured to compare magnitude magnitudes of touch pressures of the plurality of touch areas and to ignore at least one touch input in at least one touch area, wherein the touch driver is configured to compare a magnitude of touch pressure of a first touch cell having a maximum value in a first touch area to a magnitude of touch pressure of a second touch cell in a second touch area and to generate a touch signal of the first touch cell or a touch signal of the second touch cell, and when the magnitude of the touch pressure of the second touch cell is less than or equal to about 90% of the magnitude of the touch pressure of the first touch cell, the touch driver is configured to ignore a touch input in the second touch area.

2. The pressure sensor of claim 1 , wherein the touch driver is configured to detect touch cells having a maximum value of magnitude of touch pressure in each of the plurality of touch areas and to compare the magnitudes of the touch pressures of the detected touch cells.

3. The pressure sensor of claim 1 , wherein, when the magnitude of the touch pressure of the first touch cell is greater than the magnitude of the touch pressure of the second touch cell, the touch driver is configured to generate a first touch signal based on a position of the first touch cell and the magnitude of the touch pressure of the first touch cell.

4. The pressure sensor of claim 3 , wherein, when the magnitude of the touch pressure of the second touch cell exceeds about 90% of the magnitude of the touch pressure of the first touch cell, the touch driver is configured to additionally generate a second touch signal based on a position of the second touch cell and the magnitude of the touch pressure of the second touch cell.

5. The pressure sensor of claim 3 , wherein, when a distance between the first touch cell and the second touch area is greater than or equal to a predetermined level and a size of the second touch area is greater than or equal to a predetermined level, the touch driver is configured to ignore a touch input in the second touch area.

6. The pressure sensor of claim 3 , wherein, when a distance between the first touch cell and the second touch area is at least about 20 mm and a size of the second touch area is at least about 400 mm 2 , the touch driver is configured to ignore a touch input in the second touch area.

7. The pressure sensor of claim 3 , wherein, when a distance between the first touch cell and the second touch area is less than about 20 mm or a size of the second touch area is less than about 400 mm 2 , the touch driver is configured to additionally generate a second touch signal based on a position of the second touch cell and the magnitude of the touch pressure of the second touch cell.

8. The pressure sensor of claim 1 , wherein, when the magnitude of the touch pressure of the second touch cell is smaller than the magnitude of the touch pressure of the first touch cell, the touch driver is configured to ignore a touch input in the second touch area.

9. The pressure sensor of claim 1 , wherein: the plurality of driving electrodes extend in a first direction on the first substrate and are spaced apart from each other in a second direction generally perpendicular to the first direction; and the plurality of sensing electrodes extend in the second direction on the second substrate and are spaced apart from each other in the first direction.

10. The pressure sensor of claim 1 , wherein the touch driver is electrically connected to a first end of each of the plurality of driving electrodes through driving electrode lines and is configured to increase a gain for a touch input signal generated from a touch cell adjacent to a second end opposite to the first end of a respective driving electrode of the plurality of electrodes to be greater than a gain for a touch input signal generated from a touch cell which is adjacent to the first end of the respective driving electrode.

11. The pressure sensor of claim 1 , wherein the touch driver is electrically connected to a first end of each of the plurality of sensing electrodes through sensing electrode lines and is configured to increase a gain for a touch input signal generated from a touch cell adjacent to a second end opposite to the first end of a respective sensing electrode of the plurality of sensing electrodes to be greater than a gain for a touch input signal generated from a touch cell adjacent to the first end of the respective sensing electrode.

12. The pressure sensor of claim 1 , wherein, when a load resistance between some touch cells of the plurality of touch cells and the touch driver is relatively increased, the touch driver is configured to increase a gain for a touch input signal generated from the some touch cells, and when a load resistance between some other touch cells of the plurality of touch cells and the touch driver is relatively reduced, the touch driver is configured to decrease a gain for a touch input signal generated from the some other touch cells.

13. A pressure sensor for a display device, comprising: a plurality of touch cells having a plurality of driving electrodes disposed on a first substrate, a plurality of sensing electrodes disposed on a second substrate overlapping the first substrate, and a pressure sensing layer interposed between the plurality of driving electrodes and the plurality of sensing electrodes overlapping each other; and a touch driver to drive the plurality of touch cells and to detect touch pressure of the plurality of touch cells; wherein the touch driver is configured to control a gain for a touch input signal of each of the plurality of touch cells based on a load resistance between each of the plurality of touch cells and the touch driver, and wherein, when a load resistance between some touch cells of the plurality of touch cells and the touch driver is relatively increased, the touch driver is configured to increase a gain for a touch input signal generated from the some touch cells, and when a load resistance between some other touch cells of the plurality of touch cells and the touch driver is relatively reduced, the touch driver is configured to decrease a gain for a touch input signal generated from the some other touch cells.

14. The pressure sensor of claim 13 , wherein: the plurality of driving electrodes extend in a first direction on the first substrate and are spaced apart from each other in a second direction perpendicular to the first direction; and the plurality of sensing electrodes extend in the second direction on the second substrate and are spaced apart from each other in the first direction.

15. The pressure sensor of claim 13 , wherein the touch driver is electrically connected to a first end of each of the plurality of driving electrodes through a driving electrode line and is configured to increase a gain for a touch input signal generated from a touch cell adjacent to a second end opposite to the first end of a respective driving electrode of the plurality of driving electrodes to be greater than a gain for a touch input signal generated from a touch cell adjacent to the first end of the respective driving electrode.

16. The pressure sensor of claim 13 , wherein the touch driver is electrically connected to a first end of each of the plurality of sensing electrodes through a sensing electrode line and is configured to increase a gain for a touch input signal generated from a touch cell adjacent to a second end opposite to the first end of a respective sensing electrode of the plurality of sensing electrodes to be greater than a gain for a touch input signal generated from a touch cell adjacent to the first end of the respective sensing electrode.

17. A display device comprising: a display panel to display an image; and a pressure sensor disposed on one surface of the display panel; wherein the pressure sensor comprises: a plurality of touch cells having a plurality of driving electrodes disposed on a first substrate, a plurality of sensing electrodes disposed on a second substrate overlapping the first substrate, and a pressure sensing layer interposed between the plurality of driving electrodes and the plurality of sensing electrodes overlapping each other, and a touch driver to drive the plurality of touch cells and to detect touch pressure of the plurality of touch cells, wherein when a plurality of touch areas including at least one touch cell is detected, the touch driver is configured to compare magnitudes of touch pressures of the plurality of touch areas and to ignore at least one touch input in at least one touch area, wherein the touch driver is configured to compare a magnitude of touch pressure of a first touch cell having a maximum value in a first touch area to a magnitude of touch pressure of a second touch cell in a second touch area and to generate a touch signal of the first touch cell or a touch signal of the second touch cell, and when the magnitude of the touch pressure of the second touch cell is less than or equal to about 90% of the magnitude of the touch pressure of the first touch cell, the touch driver is configured to ignore a touch input in the second touch area.